A preview of the Nintendo DS version of HBP has been realeased. Here is an excerpt:

Most of the Hogwarts school is represented in an isometric world. Players control Harry and can explore the grounds of the wizarding school. Numerous students litter the halls and courtyards, offering friendly challenges.

The first portion of the game we tried was the Wizard Duel. Players face off in one on one magic fights with fellow students. Players use the touch screen to attack and defend. The touch screen is split into two sides to switch between attack spells and defense spells.

Read the full article here.

Thanks MuggleNet!